include/linux/ipv6.h

   1 #ifndef _IPV6_H
   2 #define _IPV6_H
   3
   4 #include <linux/in6.h>
   5 #include <asm/byteorder.h>
   6
   7 /* The latest drafts declared increase in minimal mtu up to 1280. */
   8
   9 #define IPV6_MIN_MTU    1280
  10
  11 /*
  12  *      Advanced API
  13  *      source interface/address selection, source routing, etc...
  14  *      *under construction*
  15  */
  16
  17
  18 struct in6_pktinfo {
  19         struct in6_addr ipi6_addr;
  20         int             ipi6_ifindex;
  21 };
  22
  23
  24 struct in6_ifreq {
  25         struct in6_addr ifr6_addr;
  26         __u32           ifr6_prefixlen;
  27         int             ifr6_ifindex;
  28 };
  29
  30 #define IPV6_SRCRT_STRICT       0x01    /* this hop must be a neighbor  */
  31 #define IPV6_SRCRT_TYPE_0       0       /* IPv6 type 0 Routing Header   */
  32 #define IPV6_SRCRT_TYPE_2       2       /* IPv6 type 2 Routing Header   */
  33
  34 /*
  35  *      routing header
  36  */
  37 struct ipv6_rt_hdr {
  38         __u8            nexthdr;
  39         __u8            hdrlen;
  40         __u8            type;
  41         __u8            segments_left;
  42
  43         /*
  44          *      type specific data
  45          *      variable length field
  46          */
  47 };
  48
  49
  50 struct ipv6_opt_hdr {
  51         __u8            nexthdr;
  52         __u8            hdrlen;
  53         /*
  54          * TLV encoded option data follows.
  55          */
  56 };
  57
  58 #define ipv6_destopt_hdr ipv6_opt_hdr
  59 #define ipv6_hopopt_hdr  ipv6_opt_hdr
  60
  61 #ifdef __KERNEL__
  62 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
  63 #endif
  64
  65 /*
  66  *      routing header type 0 (used in cmsghdr struct)
  67  */
  68
  69 struct rt0_hdr {
  70         struct ipv6_rt_hdr      rt_hdr;
  71         __u32                   reserved;
  72         struct in6_addr         addr[0];
  73
  74 #define rt0_type                rt_hdr.type
  75 };
  76
  77 /*
  78  *      routing header type 2
  79  */
  80
  81 struct rt2_hdr {
  82         struct ipv6_rt_hdr      rt_hdr;
  83         __u32                   reserved;
  84         struct in6_addr         addr;
  85
  86 #define rt2_type                rt_hdr.type
  87 };
  88
  89 /*
  90  *      home address option in destination options header
  91  */
  92
  93 struct ipv6_destopt_hao {
  94         __u8                    type;
  95         __u8                    length;
  96         struct in6_addr         addr;
  97 } __attribute__ ((__packed__));
  98
  99 struct ipv6_auth_hdr {
 100         __u8  nexthdr;
 101         __u8  hdrlen;           /* This one is measured in 32 bit units! */
 102         __be16 reserved;
 103         __be32 spi;
 104         __be32 seq_no;           /* Sequence number */
 105         __u8  auth_data[0];     /* Length variable but >=4. Mind the 64 bit alignment! */
 106 };
 107
 108 struct ipv6_esp_hdr {
 109         __be32 spi;
 110         __be32 seq_no;           /* Sequence number */
 111         __u8  enc_data[0];      /* Length variable but >=8. Mind the 64 bit alignment! */
 112 };
 113
 114 struct ipv6_comp_hdr {
 115         __u8 nexthdr;
 116         __u8 flags;
 117         __be16 cpi;
 118 };
 119
 120 /*
 121  *      IPv6 fixed header
 122  *
 123  *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
 124  *      are glued to priority now, forming "class".
 125  */
 126
 127 struct ipv6hdr {
 128 #if defined(__LITTLE_ENDIAN_BITFIELD)
 129         __u8                    priority:4,
 130                                 version:4;
 131 #elif defined(__BIG_ENDIAN_BITFIELD)
 132         __u8                    version:4,
 133                                 priority:4;
 134 #else
 135 #error  "Please fix <asm/byteorder.h>"
 136 #endif
 137         __u8                    flow_lbl[3];
 138
 139         __be16                  payload_len;
 140         __u8                    nexthdr;
 141         __u8                    hop_limit;
 142
 143         struct  in6_addr        saddr;
 144         struct  in6_addr        daddr;
 145 };
 146
 147 /*
 148  * This structure contains configuration options per IPv6 link.
 149  */
 150 struct ipv6_devconf {
 151         __s32           forwarding;
 152         __s32           hop_limit;
 153         __s32           mtu6;
 154         __s32           accept_ra;
 155         __s32           accept_redirects;
 156         __s32           autoconf;
 157         __s32           dad_transmits;
 158         __s32           rtr_solicits;
 159         __s32           rtr_solicit_interval;
 160         __s32           rtr_solicit_delay;
 161         __s32           force_mld_version;
 162 #ifdef CONFIG_IPV6_PRIVACY
 163         __s32           use_tempaddr;
 164         __s32           temp_valid_lft;
 165         __s32           temp_prefered_lft;
 166         __s32           regen_max_retry;
 167         __s32           max_desync_factor;
 168 #endif
 169         __s32           max_addresses;
 170         __s32           accept_ra_defrtr;
 171         __s32           accept_ra_pinfo;
 172 #ifdef CONFIG_IPV6_ROUTER_PREF
 173         __s32           accept_ra_rtr_pref;
 174         __s32           rtr_probe_interval;
 175 #ifdef CONFIG_IPV6_ROUTE_INFO
 176         __s32           accept_ra_rt_info_max_plen;
 177 #endif
 178 #endif
 179         __s32           proxy_ndp;
 180         __s32           accept_source_route;
 181 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
 182         __s32           optimistic_dad;
 183 #endif
 184         void            *sysctl;
 185 };
 186
 187 /* index values for the variables in ipv6_devconf */
 188 enum {
 189         DEVCONF_FORWARDING = 0,
 190         DEVCONF_HOPLIMIT,
 191         DEVCONF_MTU6,
 192         DEVCONF_ACCEPT_RA,
 193         DEVCONF_ACCEPT_REDIRECTS,
 194         DEVCONF_AUTOCONF,
 195         DEVCONF_DAD_TRANSMITS,
 196         DEVCONF_RTR_SOLICITS,
 197         DEVCONF_RTR_SOLICIT_INTERVAL,
 198         DEVCONF_RTR_SOLICIT_DELAY,
 199         DEVCONF_USE_TEMPADDR,
 200         DEVCONF_TEMP_VALID_LFT,
 201         DEVCONF_TEMP_PREFERED_LFT,
 202         DEVCONF_REGEN_MAX_RETRY,
 203         DEVCONF_MAX_DESYNC_FACTOR,
 204         DEVCONF_MAX_ADDRESSES,
 205         DEVCONF_FORCE_MLD_VERSION,
 206         DEVCONF_ACCEPT_RA_DEFRTR,
 207         DEVCONF_ACCEPT_RA_PINFO,
 208         DEVCONF_ACCEPT_RA_RTR_PREF,
 209         DEVCONF_RTR_PROBE_INTERVAL,
 210         DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
 211         DEVCONF_PROXY_NDP,
 212         __DEVCONF_OPTIMISTIC_DAD,
 213         DEVCONF_ACCEPT_SOURCE_ROUTE,
 214         DEVCONF_OPTIMISTIC_DAD,
 215         DEVCONF_MAX
 216 };
 217
 218 #ifdef __KERNEL__
 219 #include <linux/icmpv6.h>
 220 #include <linux/tcp.h>
 221 #include <linux/udp.h>
 222
 223 #include <net/if_inet6.h>       /* struct ipv6_mc_socklist */
 224 #include <net/inet_sock.h>
 225
 226 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 227 {
 228         return (struct ipv6hdr *)skb_network_header(skb);
 229 }
 230
 231 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 232 {
 233         return (struct ipv6hdr *)skb_transport_header(skb);
 234 }
 235
 236 /*
 237    This structure contains results of exthdrs parsing
 238    as offsets from skb->nh.
 239  */
 240
 241 struct inet6_skb_parm {
 242         int                     iif;
 243         __u16                   ra;
 244         __u16                   hop;
 245         __u16                   dst0;
 246         __u16                   srcrt;
 247         __u16                   dst1;
 248         __u16                   lastopt;
 249         __u32                   nhoff;
 250         __u16                   flags;
 251 #ifdef CONFIG_IPV6_MIP6
 252         __u16                   dsthao;
 253 #endif
 254
 255 #define IP6SKB_XFRM_TRANSFORMED 1
 256 };
 257
 258 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 259
 260 static inline int inet6_iif(const struct sk_buff *skb)
 261 {
 262         return IP6CB(skb)->iif;
 263 }
 264
 265 struct inet6_request_sock {
 266         struct in6_addr         loc_addr;
 267         struct in6_addr         rmt_addr;
 268         struct sk_buff          *pktopts;
 269         int                     iif;
 270 };
 271
 272 struct tcp6_request_sock {
 273         struct tcp_request_sock   tcp6rsk_tcp;
 274         struct inet6_request_sock tcp6rsk_inet6;
 275 };
 276
 277 /**
 278  * struct ipv6_pinfo - ipv6 private area
 279  *
 280  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 281  * this _must_ be the last member, so that inet6_sk_generic
 282  * is able to calculate its offset from the base struct sock
 283  * by using the struct proto->slab_obj_size member. -acme
 284  */
 285 struct ipv6_pinfo {
 286         struct in6_addr         saddr;
 287         struct in6_addr         rcv_saddr;
 288         struct in6_addr         daddr;
 289         struct in6_addr         *daddr_cache;
 290 #ifdef CONFIG_IPV6_SUBTREES
 291         struct in6_addr         *saddr_cache;
 292 #endif
 293
 294         __be32                  flow_label;
 295         __u32                   frag_size;
 296         __s16                   hop_limit;
 297         __s16                   mcast_hops;
 298         int                     mcast_oif;
 299
 300         /* pktoption flags */
 301         union {
 302                 struct {
 303                         __u16   srcrt:2,
 304                                 osrcrt:2,
 305                                 rxinfo:1,
 306                                 rxoinfo:1,
 307                                 rxhlim:1,
 308                                 rxohlim:1,
 309                                 hopopts:1,
 310                                 ohopopts:1,
 311                                 dstopts:1,
 312                                 odstopts:1,
 313                                 rxflow:1,
 314                                 rxtclass:1;
 315                 } bits;
 316                 __u16           all;
 317         } rxopt;
 318
 319         /* sockopt flags */
 320         __u8                    mc_loop:1,
 321                                 recverr:1,
 322                                 sndflow:1,
 323                                 pmtudisc:2,
 324                                 ipv6only:1;
 325         __u8                    tclass;
 326
 327         __u32                   dst_cookie;
 328
 329         struct ipv6_mc_socklist *ipv6_mc_list;
 330         struct ipv6_ac_socklist *ipv6_ac_list;
 331         struct ipv6_fl_socklist *ipv6_fl_list;
 332
 333         struct ipv6_txoptions   *opt;
 334         struct sk_buff          *pktoptions;
 335         struct {
 336                 struct ipv6_txoptions *opt;
 337                 struct rt6_info *rt;
 338                 int hop_limit;
 339                 int tclass;
 340         } cork;
 341 };
 342
 343 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 344 struct raw6_sock {
 345         /* inet_sock has to be the first member of raw6_sock */
 346         struct inet_sock        inet;
 347         __u32                   checksum;       /* perform checksum */
 348         __u32                   offset;         /* checksum offset  */
 349         struct icmp6_filter     filter;
 350         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 351         struct ipv6_pinfo       inet6;
 352 };
 353
 354 struct udp6_sock {
 355         struct udp_sock   udp;
 356         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 357         struct ipv6_pinfo inet6;
 358 };
 359
 360 struct tcp6_sock {
 361         struct tcp_sock   tcp;
 362         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 363         struct ipv6_pinfo inet6;
 364 };
 365
 366 extern int inet6_sk_rebuild_header(struct sock *sk);
 367
 368 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 369 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 370 {
 371         return inet_sk(__sk)->pinet6;
 372 }
 373
 374 static inline struct inet6_request_sock *
 375                         inet6_rsk(const struct request_sock *rsk)
 376 {
 377         return (struct inet6_request_sock *)(((u8 *)rsk) +
 378                                              inet_rsk(rsk)->inet6_rsk_offset);
 379 }
 380
 381 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 382 {
 383         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 384 }
 385
 386 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 387 {
 388         struct request_sock *req = reqsk_alloc(ops);
 389
 390         if (req != NULL)
 391                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 392
 393         return req;
 394 }
 395
 396 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 397 {
 398         return (struct raw6_sock *)sk;
 399 }
 400
 401 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 402                                            const struct sock *sk_from)
 403 {
 404         int ancestor_size = sizeof(struct inet_sock);
 405
 406         if (sk_from->sk_family == PF_INET6)
 407                 ancestor_size += sizeof(struct ipv6_pinfo);
 408
 409         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 410 }
 411
 412 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 413 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 414
 415 struct inet6_timewait_sock {
 416         struct in6_addr tw_v6_daddr;
 417         struct in6_addr tw_v6_rcv_saddr;
 418 };
 419
 420 struct tcp6_timewait_sock {
 421         struct tcp_timewait_sock   tcp6tw_tcp;
 422         struct inet6_timewait_sock tcp6tw_inet6;
 423 };
 424
 425 static inline u16 inet6_tw_offset(const struct proto *prot)
 426 {
 427         return prot->twsk_prot->twsk_obj_size -
 428                         sizeof(struct inet6_timewait_sock);
 429 }
 430
 431 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 432 {
 433         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 434                                               inet_twsk(sk)->tw_ipv6_offset);
 435 }
 436
 437 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 438 {
 439         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 440                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 441 }
 442
 443 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 444 {
 445         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 446 }
 447
 448 static inline int inet_v6_ipv6only(const struct sock *sk)
 449 {
 450         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 451                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 452 }
 453 #else
 454 #define __ipv6_only_sock(sk)    0
 455 #define ipv6_only_sock(sk)      0
 456
 457 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 458 {
 459         return NULL;
 460 }
 461
 462 static inline struct inet6_request_sock *
 463                         inet6_rsk(const struct request_sock *rsk)
 464 {
 465         return NULL;
 466 }
 467
 468 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 469 {
 470         return NULL;
 471 }
 472
 473 #define __inet6_rcv_saddr(__sk) NULL
 474 #define inet6_rcv_saddr(__sk)   NULL
 475 #define tcp_twsk_ipv6only(__sk)         0
 476 #define inet_v6_ipv6only(__sk)          0
 477 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 478
 479 #define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
 480         (((__sk)->sk_hash == (__hash))                          && \
 481          ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))      && \
 482          ((__sk)->sk_family             == AF_INET6)            && \
 483          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 484          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 485          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 486
 487 #endif /* __KERNEL__ */
 488
 489 #endif /* _IPV6_H */